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LMMSE filter for Rician MRI data

4.5 | 4 ratings Rate this file 15 Downloads (last 30 days) File Size: 3 KB File ID: #36741 Version: 1.2
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LMMSE filter for Rician MRI data



17 May 2012 (Updated )

A filtering scheme for denoising MR data assuming an underlying Rician model.

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The linear minimum mean square error (LMMSE) estimator estimates the signal out of a noisy MR adquisition. The method automatically estimates the noise level from background. It is based on a Rician noise assumption, which is valid for single coil adquisitions (and sometimes in SENSE).

The whole method is described in

S Aja-Fernández, M. Niethammer, M. Kubicki, M. E. Shenton, C.F. Westin, "Restoration of DWI data using a Rician LMMSE estimator". IEEE Tr. on Medical Imag. Vol. 27, No. 10, Oct. 2008, pp. 1389-1403.

MATLAB release MATLAB 5.3 (R11)
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Comments and Ratings (7)
15 Apr 2016 afshin shoeibi


23 Mar 2016 majid sadeghi


21 Jul 2015 Ram Singh

very good stuff

Comment only
27 Jan 2015 Jorge Rubio Álvarez  
01 Jul 2014 Christian

very useful! thank you!


The method now requires to choose one of the existing noise estimation methods as an input: (See help)


However, I have just realized that the function moda.m is not in the toolbox. I upload now a new version with this fixed, and a default option

Comment only
11 Jun 2012 Alex

Alex (view profile)

I get the error:

I_est = MRI_lmmse(img,[10, 10]);
Undefined function or variable "sigma2".

Error in MRI_lmmse (line 137)

Did I input something incorrectly?

Comment only
12 Jun 2012 1.2

Default method to estimate noise is added. Function moda.m was missing and it was added to the end to the file.

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